Device for making ring joints



Feb. 15 1927.

W. L. EVANS DI-:vIc'E FOR MAKING RING JoINTs Filed 111111.25, 1925 5 sheets-sheet 1 Feb. 159 192m w. x.. x-:VANS

DEVICE FOR MAKING RING'JOINTS v Fi1ed'Aug-25, 1925 v5 sheets-sheet 2 ma@ l' M-MM.

5 w. L.; EVANS DEYICEKFOR MAKING am@ JOINTS Feb.

Filed Aug`. 25 1925 5 sheets-sheet s gnou/do@ Feb. 15, 1927., 1,617,622

w. 1.,. EVANS DEVICE FOR MAKING 'RING roINTsy Filed Aug.25, 1925 SSheets-sheet 4 l tkoznoq Feb, 15 wz 1,617,622

w. 1 EVANS DEVICE FOR MAKING RING JvOINTS Filed Aug.25l 1925 5 sheets-sheet 5 l AJ5 Patented Feb. 15,1927.

UNET SS WILLIAM L. EVANS, 0F WASHINGTON, INDIANA.

DEVICE. FORNMAKING RING JoIN'rs.

Application led August 25, 1325. Serial No. 52,445.

This invention relates to devices for join- Y ing trim, molding, or other material, by whatV is known as a ring joint. rIn making this type of joint, after the pieces to be joined are cut in the proper form, channels Vor grooves are cut in their rear faces in such a manner as to form a continuous circular Channel when the pieces are properly joined. While thepieces are clamped in this position, a ring is forced into this channel, and thisring is of such size and shape that it will exert a forceful gripping action against the inner wall of the channel andhold the joint tightly together.

Important objects of the invention are to provide improved means for clamping the Ypieces while the channel is being cut, to provide improved means for cutting said channel, and to provideA improved means for eX- panding the ring and vforcing it withgreat pressure over the circular bossdefined by the channel, thus forming a joint that is held together with great pressure, so that it will not open 'even when there is considerable shrinkage in the. wood itself. The eilicacy ofthe joint is also increased by an improvement in the formation of the ring itself.

The specific construction of one embodiment of the invention is fully shown in the accompanying drawings, and the advantages vhereof will be specitically'e-Xplained in connection therewith.

In the drawings: j Figure 1 is a side elevation of the machine.

Figure V2 is a vertical longitudinalvsecton thereof. I

Figure 3 is a front elevation with parts shown in section.

FigureI 4 is a rear elevation with the motor removed.

Figure 5 is a plan view. j

Figure 6 is a horizontal section taken on the line 6-6 of Figure 2.

Figure 7 is a horizontal section taken on the line 7-7 of Figure 2.

Cil

Figure S is a horizontal section taken just above the pedal mechanism. l

Figure 9 is a detail view of one form of ring.

Figure of ring.

Figure 11 is a View showing a completed joint.

Figure 12 is an enlargedview of the cutter head detached.

10 is a detail View of another form vThe machine for making the ring joints comprises a main frame 1, in the form of a rectangular housing with a work table 2 at its upper end. -Mounted for slidable adjustment on this table is a gage bracket 8, the form of which will depend upon the character of the joint to be formed. In the present instance, I have shown a bracket used for making corner joints, andhaving a right angular seat 4e against which rest the ends of the two pieces toV be joined.` A dog 5 is pivotally mounted on one side of the bracket, and is yieldably held by a spring 6, so that a notch 7, formed at its inner end, engages a stud 8 which is adjustably mounted in a sloty 9 formed longitudinally of the table. -It is, preferred to use two of these studs when joining wide pieces, so that two rings may be used on each joint.

A vertical bar 10 is slidably mounted at the rear side of the frame 1 in 1' guideways 11 and 12, and is formedwith an overhanging head 13, in which a ram lL-is adjustably mounted. This ram is used for clamping thel work while the channel is being cut, as well as for forcing the ring into the channel for completing the joint. The head 13 is normallyheld in raised position bya strong coil spring 15, which is connected at its upper end to a. flange 16 at the rea-r vend of the table by means of an eye bolt 17, and is connected at its lower end to a stud 18 projecting from the lower end of the bar 10.

The intermediate portion of the frame l is formed with an oil reservoir 19, within which the power-operated mechanism operates. vertical cutter shaft 20 is mounted for rotatable and rectilinear movement in a bearing 21, which contains suitable packing to prevent escape of the oil. The upper portion of the cutter shaft is mounted in a bearing 22, at the lower side' of ahousing 23 secured underneath the` table. 'A cutter head 24, secured to the upper end ofthe shaft 20. is formed from a cylindrical-'steel barrel, and is provided with opposed vdrag teeth 25 adapted'to cut the channel, fand spurs 26 and 27, slightly longer than thedrag teeth, for cuttingthe outer and inner sides, respectively, of thev channel. A flat ring 28 is adapted to rest 4on a shoulder 29,

and is provided with an opening just large enough for the cutter head to pass through,

so that the work 30 may be firmly supported. A fan 3l is secured to the cutter shaft 2O within theV housing 23, andblows the shav- V`ings out throufhnan opening;,232Y forin'edin Y the side ofthe-'housing'.

i' this Alink isY pivotal-ly'k connected( at 36`r to the The mechanism forfdra'wing the head '13 downwardly to clampthe'work-On'the-table:v

1 2 comprises a pedal 33, located at the letthand side of the machine, Yand connectedV intermediately bya pivot stud34 ytoathe lower end cf a link 35. I The upper end'of barl l10; Therrear: end A`of the pedal .E3-is. pivotedfon astud 37', which projects from.

V5 angiritermediate pointof aaleverzSS'fthrough am lar-cuate slot A39 .in c the lett-hand ,side of the-iframei The rearfend otthe lever 38l isfpifvoted .at 40 to. theframe,f and its front i end projectsfforwardly/through thel frontnectedif-at 41 ;to the-lowerend lof vertical n frodi 42...y This 4rod Y is guidedor vertical movement 1in; lguide members 431 and; 44 ses curedgtolthcifront side'oit theiii-ramev A circular channels the pieces ftobefj oine'd yare gages, thetguide member 44ftolimitthe Vdownwardfmovementi of the rodeV while an expausilevcoilespringAly,acting betweenfxthe guide member 44 .and a collar-47 ad-i ust-ably; secured to the rod, normally ,h'olds the lattery ini,itsi-lowerinostfzposition; 1

Then -operatingthe machine-f to cut the placedinthe.y properpositionagainst:r the The first: result-zot the e depressionofthe pedal V;is tof draw the-v head v13 downwardly Vthrough lthe -mediunr offthelink 35Wr against thcfetension.` of the-uspr-ingu untilsithe work. is,-clainpedbencath the-rain 14,. During crumfabout which the pedal 33 movesy When:

Ythe workfisfthus clamped and; the,l head' 13 canlgnotwmoire downwardly any farther, in-

creasedpressure ,onmtlaepedal 138; causes-the Crum, andy A;to swing. the y lever i 38 upwardly: about f the fpivote as fulcrurng-raising the.

, rod ,42.1. A-lug4f48 0in-the lever 38 ,thenA ens` gages the lower endyotlthe.` cutterL shaft L 20,-

e C1 l Y and raises ethe cutter-V` into engagement .witlr thelfwoak.; The Acutter `is constantly' iro.-e

Ylated; Vby means -hereinafteri describech, .and

cuts a, circular chai-mele the: depthf of .which is,- lii'ni-.ted' the.` engagement of thev iup-i perrendof they rod 42. withiagage block14-9 adjnstably mountedY onv a fthreaded spindlei -Whichextends 1 downwardly from l the table ,-2.; L

' The'cutter'shalitfQO-iskdriven byiineanso. Y a'rpulley 1511; secured Lto-its lower, end, anda cured to the shaft`v offA a. imo-ter 54-,wliiclii `is supported V.on-= bolts v 55 rprojecting.-f fromy the` rea'rfY side-oftff-the'fiframe; These bolts are. mounted` for vlongitaid-inal- Aadjustment sovas tof adjust-Y thewtensionaof: the belt- V52, l,and the pulley 51 is long enough 'to allow for the vertical movement ofthe Ycutter shaft' witnoutV 'causing the belt to run' off.

A power shaft 56 is mounted transversely iiilbearings-to'rotate within the oil reservoir 19, vand has a worm gear 5,8 keyed y thereon; which" is driven in a clockwise direction, asl viewed in Figure 2,. by a lett-V handwo'rin 59 secured to the cutter lshaft 20.; Thebearings 57 are supported in side `plates-60,'which `are securely'bolted to the. sides otthe frame. to cover openings 61,7'

whichare providedl for convenience` in kassemblingv the mechanism. Suitable gaskets are .provided beneath theY side plates 60 to preventleakageof oil from the reservoir 19;' and. oilholes 57"@ are providedy to rinsurepe'rfeet-lubrication of the bearings.V

d The shaft 56'and worm gear 5,8 rotate` idly during. ,the operationl oi cutting theV circular channel, butv areV voperatively connected tothebarrlO, Vso as to orcethe head 13 1and ram 14A downwardly with great pressure when/the ringv is being forced into the ch'annelv to complete the joint.; TheYmechanismx orelect-ingthis connection will now bedescribed; A ,dog 62 i is pivotal] y `mounted ,at v63 (mman, airinbll,,which projects forwardly from therbarA 10. i rllhisdog terminates` in a` flat nose 65 above which is a notch 66;' ThisA 'notchgI when. the (logis moved 'into proper`- position., .is adaptedto be engaged'by, a

crank 56a formedl on .the shalt 56, and to be Y drawn downwardly thereby. The dogl GQ'is orniedwvith Vazrearwardly projecting arm. 67, the rear end of which 1s pivotall'y con.w

nected,-as at 68, to :the upper end of a link' i 69: which .extends downwardly at the ri ghtf handuside ofktheY frame, .and at its lower cndis pivotally connected,1as=at 70; to a, pedal 71V. Ther-ear end offthe pedal'71'is fulcrumed 72 on the rame,-andfthe pedal isnormally held.y .upby aY coil spring'i atV iached to the side of the frame.

After; the'. channelY has been cut in Ithe work 30 the latte-r is turned over, to the posi. tionshown in vFigure The pedal 71 is' then depressed `to swing the dogl forwardlyabout itsppivot 63. This causes the crank 56a first to engage the nose 65 and," iri' conjunction with thepressune exerted 'oni-the' dog/by .the action of vthe pedal, .draws-the head downwardly until resistance is'A en.,

countered. They crank .will` then .have rid-V 'Y den vinto the notch 66 andf'will lorciblyfen,F gage the outerside 74 thereof. This outer side7 4 is cut at such" an angle,` that the crank 562% approaches-Vit .very nearly at right angles. Y

which, of course, is proportional to the pressure exerted on the pedal 71, the dog 62 is thrown outwardly and the crank 56 rides out'of the notch, releasing the bar 10, and permitting it to move upwardly under the iniiuence of the spring 15.

In cutting the circular Vchannel in the work 30, the latter is clamped to the table by the engagement of the rim of the ram 14 with the front face of the work. After the channel has been cut, and the work placed in the position shown in Figure 3, a steel block l is placed thereon, which is in the shape of'a frustum of a cone, with its base of slightly less diameter than that of the boss formed within the circular' channel. A ring 76 of steel is placed over the smaller end of the block 75. This ring may be of the shape shown in Figures 9 and 11, having a plurality of opposed straight sides 77 connected by arcuate portions 78. As the ram 14 is forced downwardly, the edge of its rim engages the ring, and Vforces it downwardly into the circular channel which has been formed in the wood. During this operation, the mid-points of the sides 77 areV forced outwardly, causing the sides to assume substantially an arcuate sha-pe, while the arcuate portions 7S are elongated, and their midpoints are drawn inwardly. The greater the pressure, the more nearly the ring approaches to a true circle. The ring is made strong and of heavy gage, and its total inside perimeter is scarcely more than the inside perimeter Vof the channel, lso that a tremendous press-ure is required to force the ring into position, and the tendency of the ring to resume its original shape causes the joint to beheld tightly together with enormous pressure.

The ring may be made in different shapes as, for example, that shown at 7 6a in Figure 10, which is substantially in the form of a polygon, having a plurality of substantially straight sides 79. `In applying such a ring tothe joint, the mid-points of the sides 79 are forced outwardly', so that the sides assume substantially an arcuate form, and the corners 8O are drawn inwardly, and the ring approaches more nearly to a circular shape as it isy forced downwardly over the larger end of the block 7 5.

As explained above, the trim, vor other material, to be joined is placed in position beneath the ram 14, and a depression of the pedal 33 first causes the trim to be clamped on the table, and then causes the cutter to rise into contact with the under surface of the trim. The tension of the spring 15 may be adjusted with respect to the tension of the spring 4G, so that the work will be clamped with the desired force before the cutter is raised. The stop 49 may be adjusted to determine the depth to which the circular channel is cut. After the pedal is released, although the shaft 56 and worm gear 58 continue to rotate, their weight and the high speed of rotation causes considerable frictional resistance vand this resistance, aided by gravity, causes the left-hand worm and the cutter shaft to work downwardly to their original position. vThe work is then turned the other side up, and the same head, which clamped the work rwhile the channel wlas being cut, is used to force the ring into ace. Y

It will, of course, be understood that different type and'sizes of attachments may be used with the machine, Vdepending upon the nature of the work to be performed. In joining molded trim, aBabbitt metal form is fitted to its face, so thatit will rest solidly on the table while the ring is being applied. In connecting long pieces, trestles'may be provided for supportingtheir free ends. l/Vhile I have shown and described `specilically one form in which-the invention may be embodied, it is to beunderstood that various modifications may bemade in the structure and arrangement of the various parts without any .material departure from the essential features thereof as defined in the appended claims.

VYhat is claimed is:

1. In a machine of theclass described,the

combination of a table, a verticallymovable bar having a head overhanging the table, a pedal having a connection with I,said bar to move the latter downwardly whensaid pedal is' depressed, a power-driven shaft, means for temporarily connecting said shaft to the bar to forcibly urge the latter downwardly,

a second pedal, and means connecting the same to said first-mentioned means to establish the temporary connection between the ment, a second pedal, and means connecting* the same to the dog to establish the connection between the latterand the crank so as to forcibly urge the bar downwardly.

3. In a machine of th-e class described, the combination of a table, avertically movable bar having a head overhanging the table, an actuating member having a connection with said bar to move the latter downwardly to clamp Vthe work when said member is depressed, a constantly driven shaft having a cutter secured thereon, means operable upon I Y further dep'nessi-oni0tsaid membert to- ,Inove thesliaftfso that the.: cutter Vwill operate'` on `thesworlr, a@second#A shaft constantly L drivenby 4. the cutter shaft, means-for temporarily l connecting; said. Second: shaft i to ,the-flearf to,

forcibly; nrgei -tlie latter? downwardly,` assecond' actuating member, zand Ymeans` conneet- Y infclf'the` samewtoifsaid irstmentroned' means; towestablislif tlfie temporary connections-bef ltweenusaid. Second f shaft rand. the bar` when, ,said second actuating member is depr-essedo Y 4. In a InaehineorY the elassdeseribed, nthe Combination of :Li-table, aivertieallly l movablel Y bar havingay head overhangingigthei t'able,a

ll pedal `:havingaa connectionwith sai-'daher torf move the latter' Vdownwardliy` to .elampthe Workwhen the pedal ie depressed, a. con-f stantlydriven sh'aff-t harvingya. icntt'er `secured thereto, fmeens ,operable open l'fnrther. Vdepres-i 202 sioni vof .the pedalto, vmovefeaid shaft' vso, that the cutter vmay operate on-A the :worin af second;v

Vshaft having-a crank; meansffoiwdriving said secondiv shafft, .adog pivotollv 'connected to:

o said* bar: and -fhaving ag=iiotelr thereimlsaiiil.

e dogf being :so arrangedv that ,it lmay vbe.swung` Y tovbringjhe noteh-into positioncto beA rengagged'byqthei-eranl'A omthel downward portion of its movement, a se'contbpeda'l, and

means eonnecting the same. to `the dogV to 361' establishthe eonneetionebetween the latter and k-th'e cranlesoA as tolforeibly Hrgetlie bar i downwardly. Y v

5.2 In amachine of the Class describedythel Y 'dombinati-onfot a table, a verticallyV movable- 351. bar having-a head Vover-hanging the table,-a

power-drivenr shat havingiaerank, a inem? ber connected to said bar and normally ont of the Vpath-,fof the crank, andmeans for sliiftingusaid member into thevpath .of the- 40 c rankifso asto befengaged thereby to forcibly move the bar and head. downwardly,.f

6; Inf aA 'machine of itheclass described?, the

combination of a'table,'.afvertieally n evable-l bar having-a heady overhangjinggthe table,ai pow-er'drlven shaft having a crank, aniaetuabing; member, meensectuated,byftliedepres- Y sion 'of said memberffer connectingthe crank to "the barato` exert a downward .orceon. the latter which is directlyproportionalwtothe force with which saidy actuating..member isv depressed.v Y f o y fr', Inv-a machineol' thevclass described, the combination of afvertieally movable member,l

a 4link connected at its nppersend toi said.,

member, a pedal `intermediately pivoted .toil thelowerend of the link,y a lever nlcrumedV at .one end andv intermediately pivoted .tofthe rear end. of said pedal, 'a Second. vertic movable member inr the path of .said leT so astobe raised thereby, andresilientmeans -reeisting the' movement ofsaid, lever, vvher-e-Y Y edY actuating member, Second rectilinearly" movable member in fthe pethfotsaid devel' so as to be movedethereby, and resilient means resisting themovementot .said lever7 whereby vthe first rectilinearly movable men'rber is actuated: by the link rwith a predeter-` mined force beiorelthe'lever begins to. move.

Inteetimony that lfclaim the foregoing.

as my own, I have hereto affixed my sigenature. 

